Check-valve



(No Model.)

-D. AUSTIN 8v F. H. SMITH.

CHECK VALVE.

No. 322,889. Patented July 28, 1885.

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y a! y 0 1 WITNESSES llv-vmrofli G UNITED STATES PATENT OFFICE,

DOR AUSTIN AND FREDRIOK H. SMITH, OF KANSAS CITY, MISSOURI.

CH EC K-VALVE.

SPECIFICATION forming part of Letters Patent No. 322,889, dated July 28, 1885.

Application filed April 24, 1885. (N0 model.)

To aZZ whom it may concern.-

Be it known that we, DOR AUsTIN and FRED- RICK H. SMITH, of Kansas City, Jackson county, Missouri, have invented certain new and useful Improvements in Check-Valves, of which the following is a full, clear, and exact description.

This invention relates particularly to checkvalves that are located at or near the lower end of tubular or driven wells, the object being to produce a valve that cannot casually become locked in an open position by means of sand or other substance that may be carried through it by water.

The invention consists in the devices and combination of devices hereinafter more fully set forth, and pointed out in the claim.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in each figure.

Figure 1 is a sectional view of a check-tube for tubular wells having the improved "checkvalve located therein. Fig. 2 is a vertical elevation of the valve removed from the checktube. Fig. 3 is a plan view of the metal valvedisk, and Fig. 4 is a like view of the lower guiding-cone.

Although a check-tube and devices for look ing it in place in a tubular well are shown in the drawings, we do not describe them here; but for a full description of such we desire to refer to United States Patent No. 313,893, of whichthey form a portion of the subject-matter.

In carrying out our invention we form a metal disk, A integral with the upper end of the valve-stem A, and provide the same end of the stem with a screw-thread, A A packing-disk, D, of rubber or other suitable material, is located upon the stem in contact with the under surface of the metal disk A, and an internally-threaded cone, E, holds it firmly in place. The end of the stem opposite the metal disk is also provided with a screw-thread, A and it carries the lower guiding-cone, B. The

cone B consists of longitudinal ribs a though its outer contour approximates very nearly that of the upper guiding-cone, E.

Upward movement of the stem A and the devices carried by it is limited by reason of a shoulder, F formed upon the lower end of the ribs (6* coming in contact with the lower end, F, of the check-tube O. Heretofore it has usually been customary to form one or more bridges across the bore of the check-tube and to have the valve-stem operate in bearings formed in such bridges; but sand has been found to lodge between the surface of the bearings and the stem, thus preventing by undue friction the easy working of the valve. Our improved construction entirely does away with all bridges, leaving the bore of the check-tube perfectly open.

The upper cone, E, guides the packingdisk D to its seat upon the upper end, a, of the check-tube by reason of the tapering surface a, sliding upon the said end of such tube, and I the ribs a of thelower cone, B,-guide the stemA during its upward movement until the shoulder F on the ribs comes in contact with v the lower end, F, of thecheclrtube.

The rubber disk D can readily be removed nut screwed upon the stem has been used to hold the packing to the disk; but this construction is useless for our purpose, and we disclaim it. The nut, not being a smooth cone, would come in contact with the upper end of our checktube and prevent the closing of the valve.

Ve are also aware that a valve having a depending weight in the form of a double cone has been located in the bottom of sand-pump buckets, the said weight being adapted to strike the bottom of the well when the bucket descends, thereby opening the valve and permitting the water to enter the bucket; but the said cone is devoid of water-passages, and for that one reason is not adapted to our checktube; for instance, it would close against the lower end of the check-tube and prevent the upward movement of the water.

Having thus described our invention, what we claim is ICO In combination with a check-tube, as O, a Valve stem or spindle carrying at one end a metal disk, and a cone having a smooth'surface for guiding the stem during downward In testimony whereof We affix our signatures in presence of two witnesses.

DOB AUSTIN.

5 movement, and at the opposite end a cone pro- FREDRIOK SMITH Vided with water-passages for guiding it dur- I Vitnesses: Ling upward movement, substantially as set I P. G. I-IILLGARDNER, forth.

. J. M. FOX. 

